to north-central florida and think, "hmm, you know, "if california can move their water across the state, why don't we go ahead and do that?" so, we are interested in understanding what the requirements of the natural system are and also understanding how major land uses in that basin, particularly agriculture, affect the water quality in the river. narrator: the suwannee river basin faces two major obstacles in the future -- increased demand and increased pollution. an average 1,000 people move into the region daily, using freshwater for their homes and septic systems. pollution levels in the basin are also increased when farmers spread fertilizers high in nutrients such as phosphorous and nitrate, on crops for increased yields. the excess fertilizer not used by the crops can be carried to rivers, causing algae and other plants to grow. this can change water quality, rendering it unfit for human consumption. dr. graham's task is to produce mathematical models used to predict how these factors and others work together to determine the health of the ecosystem. with these models, she hopes

possible by southern california consortium a close look at the earth's intricate system of running water is a close look at the evolution of earth's landscape. as they continue to shape the land around us, rivers and streams leave behind evidence of their enduring power. unlike earthquakes and volcanoes, which can cause sudden change, running water works slowly, almost imperceptibly, in shaping earth's landscape. we usually think of the grand canyon in terms of its rocks and the fascinating story that they contain, one that spans almost half of earth history. but there's more to the grand canyon than rocks. the canyon itself is a geologically active feature, a changing and evolving land form that's a monument to the power of running water. the colorado river carved this enormous valley over the last nine million years. in fact, the river carries about half a million tons of sediment past any point in the canyon every day. no wonder this great river has been described as too thin to walk on, but too thick to drink. rivers like the colorado, are powerful geologic agents that disrupt and re

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